former potrero power plant site remediation

Former Potrero Power Plant Site Remediation

WELCOMEPG&E Community Open House


Former Potrero Power Plant Site

Photo taken: March 2012.


GA

S

RESIDENCES

STREET LAMPS

BUSINESSES

MANUFACTURINGPROCESS

GAS HOLDER

COAL OR OIL

What is a Manufactured Gas Plant (MGP)?


Goals

Fulfill our commitment to address impacts from historic MGP and power plant operations.

Protect human health and the environment.

Work collaboratively with stakeholders and the community.

Protect the safety of the community and site workers.

Allow for the productive re-use of the site.


1870 1920 19701880 1930 19801890 1940 19901900 1950 20001910 1960 20152010

Timeline-Operations

1999PG&E sells Potrero Power Plant to Southern Company.

1870s–1930sAn MGP operated on Potrero Property.

1910s–1999PG&E operates Potrero Power Plant.

PG&E

March 2011Potrero Power Plant shuts down.

NRG

1999–PresentSouthern Co. (subsequently, Mirant Corp., then GenOn and now NRG Potrero, LLC) owns Potrero Power Plant.

2007–2010Trans Bay Cable Project completed.


Northeast Area Design/Implementation Timeline2011 2012 2013 2014 2015 2016 2017 2018

August 2011 – November 2012Feasibility Study Process

February 2016– November 2016Engineering Design

February 2015 – February 2017Permitting

February 2017 – January 2018Construction and Field Work

September 2012 – September 2013Pre-Design Investigation

May 2014–June 2014Solidification Pilot Test

June 2014–June 2015Remedial Action Plan Development


Project Site

Approximate boundaries shown. Map not to scale.

23RD ST.

22ND ST.

ILLINO

IS ST.

3RD

ST.

TEN

NE

SSEE

ST.

OFFSHORE SEDIMENT AREA

280

PG&E-Owned Properties NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities

N

Port Property

Station A

Tank Farm

Switchyard/Construction Yard Northeast

Area

Hoe Down Yard

Former Power Generation Facility

Approx. 500 ft.


Station A

Tank Farm


Approved Cleanup Approach: Solidification with Limited Excavation

For illustrative purposes only. Approximate boundaries shown. Images not to scale.

NortheastArea

Port Property

A portion of MGP residues around Pier 70 structures excavated

A portion of MGP residues on Power Plant Property treated in-place using cement mix (solidification)

Durable cover to be installed

Estimated time to complete: Approximately one year

NRG Potrero, LLC Owned Properties Excavation Area

Port of San Francisco Property Impacted by Historical MGP Activities Solidification Area

1

2

2

1

2


Port Property

Station A

Tank FarmNortheastArea


Solidification Pilot Test: May – June 2014

For illustrative purposes only. Approximate boundaries shown. Images not to scale.

Pilot Test will:

• Refine solidification treatment approach on a small scale

• Take approximately two months to complete

• Make use of large-scale equipment

NRG Potrero, LLC Owned Properties

Pilot Test Solidification Area

Port of San Francisco Property Impacted by Historical MGP Activities

TEST AREA

TEST AREA


Solidification Process/Equipment

DRILL RIG /CRANE

DR

ILL

/MIX

ERCEMENT MIX

PREPARATION

SOLIDIFIED / TREATED SOILS

Images not to scale. For illustrative purposes only.

1 Solidification mix will be injected into the ground.

2 The mix will solidify impacted soils in place


Title of Station

AIR MONITORING• Perimeter air monitoring—upwind and downwind of work areas • Personal air monitors for workers

ODOR CONTROL• Odor-suppressing foam • Soil cover

SOIL MANAGEMENT / DUST CONTROL• Excavated soil stored in covered containers • Covered trucks • Truck tire washing stations, pavement sweeping and soil wetting

TRUCK / EQUIPMENT TRAFFIC• Limited removal of soil and debris • Average of 2-3 truck trips per day for various purposes

Safety Measures

Images for illustrative purposes only

former potrero power plant site remediation

Documents